Rock-drill.



. Px BEST AVNLABLE CO No. 783,032. PATBNTBD PEB. 21. 1905.

' C. G. FOUTE.

ROCK DRILL.

APyLIoATIoN rum 1320.14, 190s.

4 sHBETss1EBT 1.

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Tg H I l Wilma/NW V n Rl @wom/1ro@ @n @www m www BEST AVAILABLE COF"PATBNTED PEB. 2l, 1905.

G. G. FOOTE. ROCK DMLL. APPLICATION FILED DEO. 14, 1903.

4 SHEETS-SHEET 2.

` WHT/noms @2; @JW/W BEST AVAILABLE COP` No. 783,032. PATBNTED FEB. 21,1905. s. G. Poom.

ROCK DRILL.

APPLICATION FILED 1330.14, 1903 4 SHEETS-SHEET 3.

, .B 5 Z A i all. a J. d@ c @l f 0,/ xllll'f BEST AVAILABLE COF"PATENTED FEB. 21, 1905.

C. G. FOOTB.

ROCK DRILL.

APPLICATION FILED 1320.14, loos.

4 SHEETS-SHEET 4.

4'view of the machine. .on the line 2 2, Fig. 5.

UNITED STATES Patented February 21, 1905.

APATENT .)FFICE.

CHARLES G. FOOTE, OF DENVEILCIOLORADO.

Roeien-BILL.

SPECIFICATION forming part `of Letters Patent No. 'rssgosafdatedFebruary e1, 1905.

,Application filed December 14, 1903. Serial No. 185,140. l

T0 all whom t may concern:

Be it known that LCHARLES Gr. FooTE, a citizen of the United States ofAmerica, residing in the city and county of Denver and State ofColorado, have invented certain new and useful Improvements inRock-Drills; and -Ido declare the following to bea full, clear, andexact description of the invention', such as will enableothers skilledin the art to which it appertains to make and usethe same, referencebeing had to the accompanying drawings, and to the letters and figuresof reference marked thereon, which form a partfof' this specifica- Yspringjactuated dog 18, whereby the key is lockedinthe adjustedposition.

tion.

My invention relates to improvements in rock-drills; and it consists ofthe features, arrangements, and com blnations here1nafterdescribed andclaimed, all of which will be fully understood by reference to theaccompanying drawings, in which is illustrated an embodiment thereof.

I 1n the drawings, Figure 1 is a top o'r plan Fig. 3 .is a sectionalview in detail and on a larger scale, taken longitudinally throughl thechuck extremity ot' the drill-holder. Fig. 4 is an end viewof the samelooking in the direction of the arrow in Fig. 3. Fig. 5 is a verticallongitudinal section ofthe complete machine. Figs. 6 and 7 are detailviews illustrating the construction and operation ot' the device forimparting the rotary movement to the drill-holder. Fig. 8 is a sectionalview in detail and on a larger scale, illustrating the constructionwhereby the drill-holder is drawn rearwardly against the power-spring bythe spiral cam ot' the rotary cylinder and released to allow the springto move the drill-holder forwardly. Fig. 9 is a section taken on theline 9 9, Fig. 8. Fig. 10 is adetail View illustrating the manner ofmounting the machine. Fig. 11 is a section taken on the line 11 11, Fig.10.

The same reference characters indicate the same parts in all the views.-

Let the numeral 5 designate the guide-shell, provided with a foot 6.beveled or fiared to engage a counterpart socket formed in a holder 7,provided with a hinged clamp 8. This part 8 is hinged to the body of theholder at 9 and Fig. 2 is asection taken' 4secured at. its oppositeextremity by a studbolt 10. This holderis clamped to the column orsupporting bauer-,shaft (not shown) when the drill is in actual use. Thefoot is locked inn place on the holder by an adjustable part formed'onthe holder.' The key 15 is provided with ratchet-teeth 17, engaged by aA feed-screw 19 of ordinary construction is vjournaled in theguide-shell and threaded in a nut 20, made fast to the casing 21, whichis slidablyconnected with the guide-shell by gage the outer surface ofthe parts and c.

The space between the inner surface of the part a and the outer surfaceof the parts and c is preferably filled with Babbitt metal g. The part ais composed of two twin sections a' and a2, having ears as, providedwith registering openings through which are passed bolts a, secured bynuts, whereby the parta is securely clamped to the parts band c. 1norder to absolutely insure the movement of all of the parts of thecylinder 24 in unison, stud-bolts a5 are employed to lock the partstogether. Upon the rear extremity of the part c of the cylinder isformed a spiral cam 26, which is engaged .by a projection 27, made faston the drill-holder 28. The parts b and care hollow to receive thedrill-holder, and within the part b is located a power-spring 30, whichsurrounds the drill 31. This drill passes axially through the entiremachine and may be removed at its rear extremity while the machine is inposition adjacent to and pointing toward the breast of the rock. springengages the rear end ot' the part b in- One extremity of the power-,part 12 and a-relatively stationary shoulder Vmotor and is held inoperative relation with f allowing the collar 34 to move rearwardlysuiiciently to disengage itself from the cylinoperatiOn, while theoperating parts of the teriorly, while its forward extremity engages I ashoulder 32, with which the drill-holder is provided.

The drill-holder and drill are reciprocated by the rotation of thecylinder containing' the cam-groove. This rotary action of the cylindermay be imparted in any suitable manner. As shown in the drawings, anelectric motor 33 is used forsupplying the power. This motor is solocated that its axis coincides withV the axis of the drill 31, whichpasses therethrough. Itis evident that the motor may be connected withthe rotary cylinder in any other suitable'rnanner. The armature of themotor is suitably connected to rotate a collar 34, which is int-erlockedwith the cylinder by conical projections 35, engaging counterpartrecesses formed in the rear end of the part b of the cylinder. Thecollar 34 has a limited longitudinal movementon the armature of the thecylinder by a coil-spring 36, which surrounds a rearward extension ofthe collar and Vis located between a shoulder of the collar and -a stop37, applied to the motor-armature. In case of accident or ifffor anyvreason the rotation of the cylinder is suddenly stopped or resisted withsufficient force to result in breakage of some of the parts of themachine if its; movementis continued the spring 26 will yield,

der, thus allowing' the motor to continue its drill remain stationary.

The shape of the cam 26 formed on the cylder is clearly illustrated inFig. 8. When the drill-holder is at its forward limit of movement, theprojection 27 thereof engages the point A of the cam, which will betermed the "initial point. Then as the cylinder is rotated the cam is turned andthe projection 27 of the drill-holder being-in engagementtherewith causes the latter to be moved rearwardly against the spring 29until the terminal point B of the cam is reached. Here the projection 27of the'drill-holder is released and travels forward in a straight linewith the drill-holder from the point B to the point A, the forwardmovement of the drill-holder being imparted by the recoil of the spring29, which has been placed under tension by the rearward movement-of thedrill-holder.

To the forward extremity of the drill-holder is secured a toothed wheel38 by a set-screw 39, passing through an opening in the forwardextension of the collar ofthe wheel and threaded in the drill-holder. Atthis point the body of the drill-holder 28 is connected with a reducedforward part 40 by the setscrewor stud-bolt 39. So far as the operationof the drill-holder is concerned the parts 28 and 40 are virtuallyintegral and operate in unison. Hence when the term drillholder ishereinafter referred to without using a reference character it must beunderstood that the entire drill-holding device is intended.

Between the collar of the toothed wheel and the bearing 41 of the casingis located a buffer-spring 4Q. The toothed wheel 38 is prevented fromrotating with the cylinder by a pawl 43, hinged at 44 to a stationarypart 45, secured to the casing by a screw 46. This pawl is engaged by aleaf-spring 47, also held in position by the screw 46.

Below the pawl 43 the wheel 38 is engaged by a tooth 48 of a plate 49,pivotally connected with the casing at its rear extremity, as

shown as 49, and normally held at its limit of downward movement by aspring 49e. This tooth 48 is provided with a projection C,

'extending upwardly from the body of the tooth. As the drill-holderismoved rearwardly against the power-spring the tooth 48 firstpassesbetween two teeth .or cogs of thewheel 38. Then .as the rearwardmovement of the drill-holder is continued the wheel engages the upward-projection C, which forms a stop and causes the plate 49 to turnupwardly on its pivot 49, and this upward movement (the tooth 48engaging the side of the wheel, see Fig. 2) turns the wheel anddrill-holder one tooth in a direction opposite the rotation of thecylinder. Then as the drill-holder moves forwardly the wheel becomesdisengaged from the tooth 48, while vthe plate 49 returns to its normalposition and is ready to perform the Vsame function every time thedrill-holder moves rearwardly.-

The forward extremity of the drill-holder is provided with lateralopenings in which are -placed locking-pieces 50, whose inner edges areVadapted to engage the drill 31, While their outer edges project from theopenings inthe drill-holder to engagement with a surrounding collar 51.The outer edges of the pieces 50 are inclined, being widest at theirforward extremities. The inner surface of the collar 51 is shaped toforce the pieces 50 inwardly against the drill-holder, whereby they arecaused to lock or clamp the latter securely in place as the collar 51is'rnoved forwardly. In the rear ofthe collar 51 is a washer 52, and inthe rear of this washer is a screw-sleeve 53,

which is threaded on the drill-holder and is y,

adapted to be screwed against the washer 4by the useof a Spanner-wrenchengaging pins 54, mounted on the said screw-sleeve. lt is evident thatby turning the sleeve in the one direction or the other the drill may betightened in the drill-holder or made loose therein, as desired. If itis desired toremove the drill from the drill-holder, it is onlynecessary to turn the sleeve 53 in a direction to cause it to moverearwardly a sulicient distance to allow the collar 51 to be moved inthe same direction a sufcient distance to allow the drill 31 to bedrawnrearwardly BEST AVAlLABLECOF" venient way of removing dulled drills andsubstituting sharp ones, and by reason of my improved construction muchtime is gained inl this part of the work. It is well known that drillswhile in use become quickly dull the machine it is'not necessary to turnthe casing on its support in order to make room to remove the drill fromthe front, as is usually required in taking out one drill andsubstituting another. Any length of drill-bit may be employed.

From the foregoing description the use and operation of my improvedrock-drill will be readily understood. The wires or electric conductors56, connected with the motor, may lead to any suitable source ofelectricity. When it is desired to operate the drill, the current isturned into the motor, and the rotation of the latters armature impartsa corresponding movement to the cylinder 24. From what has beenheretofore explained it will be understood that this cylinder includes anumber of parts which are connected together and rotate in unison.Everytime the cylinder completes a revolution the drillholder is movedrearwardly against the spring 30 and released, whereby the drill-holderisl thrown forwardly by the recoil of the spring. This forward movementmay be given any desired force, depending on the strength of thepower-spring employed. It is evident that the number of strokes of thedrillwill depend on the speed ofthe motor. and this may be regulated asdesired. Every time the drillholder moves rearwardly through theinstrumentality of the cam 26, as heretofore explained, the toothedwheel 38 is made to engage the tooth 48 of the plate a9, whereby thewheel, together with the drill-holder and drill, is given a rotarymovement of a degree equal to what may be termed one tooth of the wheel,or the distance from the center of one tooth to the center of the othertooth, practically. In this way the necessary rotary movement isimparted to the drill and drill-holder during the operation. As thecylinder24 is rotated the pawl 43, engaging the toothed wheel 38,prevents the wheel from rotatingin the same direction with the cylinder7, and when the toothed wheel and drill-holder are rotated it is in adirection opposite the rotary movement of the cylinder, as will beclearly understood from the drawings and description.

It will be observed by an inspection of the drawings that there is aspace /z between the forward extremity of the cylinder part b and therear or cam extremity of the cylinder part e. rlhe space t (see Fig. 8)is of sufficient width to allow the projection 27 of the drillholder topass. Hence if the drill is forced against the rock with sufficientpressure to drive the drill-holder against the power-spring 29 andcompress the latter su lliciently to cause the pin 27 to occupy aposition forward of the cam or in the space z betweenthe two cylinderparts it is-evident that the motor and the entire cylinder 24 may rotatefreely without any movement whatever of the drill-holder and drill-bit,since under the conditions stated the entire cam will be located forwardof the projection 27. y

This is an important feature,"

since it will prevent breakage of the mechan- Y ism under certaincircumstances. Again, if the drill is pressed against the rock withsufcient force to move the drill-holder longitudinally in the cylinder aportion of the distance between the parts A and B of the cam it isevident that the length ot' the drills stroke will be correspondinglydiminished.

Having thus described my invention, what I claim is- 1. In a rock-drill,the combination with a guide-shell and acasingslidable thereon, of ahollow cylinder mounted to rotate in the casing, a power-spring locatedin the cylinder, the latter being provided with a cam, and a hollowdrill-holder entering the cylinder and having a`projection engaging thecam of the rotary cylinder, whereby as the latter -is rotated, thedrill-holder is moved rearwardly against the power-spring and released.

2. The combination with acasing,of acylinder mounted to rotate therein,the cylinder being hollow,a power-spring located in the cylinder thelatter being provided with acam,a -holloo inder and having its axis inline with the axis ofthe cylinder,the drill-holder being engaged i bythe c am of the cylinder as the latter is rotated, whereby thedrill-holder is forced rearwardly against the power-spring and released,the recoil of the spring acting to throw the drill holder forwardlycausing the drill to strike the r'ock with the necessary force.

3. In adrill,the combination with a suitable support, of a hollow rotarypart, a hollowdrillholder adapted to enter said part and having its axisin line with the rotary part, the rotary part being provided with a cam,and the drillholder being provided with a projection engaging the cam,whereby as the cylinder -is rotated, the drill-holder is forcedrearwardly' i BEST AvAiLABLE coP its rearward movement, and a drillsuitably connected with the drill-holder and passing entirely throughthe machine whereby it is removable at the rear.

5. In a rock-drill, the combination with a suitable support, of ahollowdrill-holder, and a drill passing through the drill-holder andprojecting from the rear of the machine, the drill being suitablyconnected with the drillholder, and suitable means for imparting areciprocating movement to the drill-holder, comprising a hollow rotarypart which the drill enters, a spring in the rotary part, the latterbeing provided witha cam adapted to engage the drill-holder and forcethe latter rearwardly against the spring in the hollow rotary part.

6. In a rock-drill, thecombination of adrill and mechanism forreciprocating the same, the drill being of suhicient length to extendentirely through the machine from front to rear, the reciprocatingmechanism of the drill being formed hollow to permit the removal andinsertion of drills at the rear of the machine, the drill being formedof suicient length for the purpose, the hollow drill-holder throughwhich the drill passes, a hollow rol tary part surrounding thedrill-holder and provided with a cam engaging the drill-holder, and aspring located in the rotary part, the cam of thelatter acting to forcethe drillholder against the spring andrelease it as described.

7 In a rock-drill, the combination with a suitable casing, ot' a hollowdrill-holder, a hol- 35 glow rotary cylinder having its axis in linewith :the axis of the drill-holder, the drill-holder ybeing adapted toenter the cylinder, a drill passing through the drill-holder andcylinder and adapted to be removed from the rear oli' the machine, apower-spring located in the hollow of the cylinder and having itsforward extremity engaging a stop with which the drill-holder isprovided, the cylinder being provided with a cam acting on a projectionof the drill-holder, whereby as the cylinder is rotated the drill-holderis forced rearwardly against the spring and released, the latter actingto drive the drill-holder and drill forwardly.

8. In a rock-drill, the combination of a hollow drill-holder, a hollowrotary cylinder havingits axis in line with that of thedrill-holder, thedrill-holder entering the cylinder, a connection between the cylinderand drill-holder whereby the rotary action of the cylinder impartsmovement to the drill-holder in one direction, a spring for moving thedrill-holder in Vthe opposite direction, a motor for operating therotary cylinder, and a suitable operative connection between the motorand the cylinder.

9. 'Ihe combination c" a. hollow drill-holder, lich the drill-holder-ction between the erebv as the cylinder is rotated the drill-holderismoved in one direction, a power-spring connected in operative relationwith the drill-holder for imparting the forward movement thereto, amotor whose armatu're is in line with the axis of the drill-holder andcylinder; a collar interposed between the motor and the rotary cylinder,the collar being, provided with pins adapted to enter recesses formed inthe rear extremity of the cylinder, and a coil-spring located in the.rear of the collar, whereby the latter is yieldingly retained making itpossible for the collar to continue its rotation independently of therotary`cylinder.

10. In a drill, the combination with a suitable casing, of adrill-holder,atoothed wheel made fast to the drill-holder, a platepivotally connected to the casing and having a tooth adapted to passbetween two teeth of the toothed wheel as the drill-holder is moved rearw ardly,'the tooth of the pivoted plate having an upward projectionwhereby as the rearward movement of the drill-holder. is continued, theplate is raised sufliciently to impart a partial rotary movement to thewheel and drill-holder, and suitable means engaging the toothed wheel toprevent the latter from moving in a direction the reverse ofthatirnparted by the pivoted plate.

11. In a rock-drill, the combination with a95 suitable casing, ofahollow cylinder mounted to rotate therein, a power-spring located inthe rear portion of the cylinder,a hollow drillholder entering thecylinder and engaging one extremity of the power-spring, a cam formed onthe inner part of the cylinder adjacent the drill-holder and adapted toengage a projection on the drill-holder to impart a reciprocatingmovement to the latter, and the cylinder being further provided with aspace forward of the cam, of suicient width to per- IOO mit the rotationof the cylinder while the drillp holder remains stationary, when thedrillholder is forced against the power-spring sufficiently to cause theprojection of the drillholder to occupy the said space forward of thecam.

inner parts having a cam provided with a .spiral face for the lift and aperpendicular tace for the drop, and a drill-holder entering the saidcylinder and having a radial projection entering the space between theinner partsof the cylinder and acted on by the cam, and a power-springlocatedin the cylinder and engaged by the drill-holder, whereby theradial projection of the drill-holder is normally held against thecam-face.

13. lhe combination with a suitable casing, of a hollow cylinder mountedto rotate therein and composed o't' two parts transversely scp- 12. Thecombination with a suitable casing,

IIO

1 1 5 outer cooperating part surarated and an outercoperating part surrounding the two separated parts, one of the inner parts havin ,q a camprovided with a spiral face for the lift and a perpendicular face forthe drop, and a drill-holder entering the said cylinder and having aradial projection entering the space between the inner parts of thecylinder and acted on by the cam, a transverse spacebeingleftbetween theseparated parts IO of the cylinder forward of the cam to allow theradial projection of the drill-holder toen ter when'the drill is forcedagainst the rock to compress the power-spring suiiciently for thepurpose.

In testimony whereof I aflix my signature in presence of two witnesses.

v CHARLES G. FOOTE. Witnesses:

DENA NELSON', A. J. OBRIEN.

